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use LWP::UserAgent;
use HTTP::Request;
...
my $res = $ua->request(POST $url,
  Content_Type=>'form-data',
  Content =>[ettablenr => '2',etcell2x1=>'Task',etcell2x2=>'1',etcell2
+x3=>'2',etcell2x4=>'3',etcell2x5=>'High',etcell2x6=>'CSS',etcell2x7=>
+'CCCC',etcell2x8=>'Twiki Updation',etcell3x1=>'Task',etcell3x2=>'4',e
+tcell3x3=>'5',etcell3x4=>'6',etcell3x5=>'High',etcell3x6=>'DSS',etcel
+l3x7=>'DDDD',etcell3x8=>'Twiki CSV',etrows=>'3',etsave=>'Save table']
+);

$postStr ="ettablenr
=> '2',etcell2x1=>'Task',etcell2x2=>'1',etcell2x3=>'2',etcell2x4=>'3',
+etcell2x5=>'High',etcell2x6=>'CSS',etcell2x7=>'CCCC',etcell2x8=>'Twik
+i Updation',etcell3x1=>'Task',etcell3x2=>'4',etcell3x3=>'5',etcell3x4
+=>'6',etcell3x5=>'High',etcell3x6=>'DSS',etcell3x7=>'DDDD',etcell3x8=
+>'Twiki CSV',etrows=>'3',etsave=>'Save table'";
...
my $res = $ua->request(POST $url,
  Content_Type=>'form-data',
  Content =>[$postStr]);